Water-meter disk



Patented Apr. 2, 1929.

. NELSON C. COTAIBISH,

ENT, OFFICE.

or nxnwoon, onto.

WATER-METER DISK.

No Drawing.

This invention relates to a material which is insensitive to temperaturechanges or exposure to moisture and is particularly applicable to diskssuch as are used in Water meters and the like. u

I-Ieretofore disks for such use have been made from various materials,most generally of hard rubber or other rubber compound. Rubber possessesa certain advantage in thatit is of non-corrosive character but it, asWell as most other materials, possess certain disadvantages, in that itcannot Withstand the effect of heat and will become Warped and otherwisedistorted when the temperature is raised above a normal limit. Inasmuchas water meters are often subjected to the action of hot water, and evensteam, through care-- lessness of the consumer in controlling hot waterappliances, there has been frequent trouble from Warped disks in themeter.

In my prior Patent No. 1,182,354, patented May 9, 1916, 1 disclosed adisk made of carbon and a coked binder which obviated certain of thedefects of the prior disks in that it Was insensitive to tel'nperaturechanges met in practice and retained its shape regardless of theten'lperature of the water passing around it.

The present invention is an improvement upon the invention of my patentabove mentioned and has among other objects, that of retaining theadvantages of the disk disclosed in the patent While increasing itsdurability.

Other objects will hereinafter appear.

The invention will. be better understood from a description of onepractical embodiment thereof and the manner in. which the same isproduced.

In my rior disk, which has been found very satis actory, the disk wasfirst formed as disclosed in my above mentioned application, that is,carbon flour, such as that obtained from coke or lampblack, is mixedwith sufficient pitch or tar to render it plastic under heat whenmolded, approximately to percent of carbon flour being mixed with 15 to10 percent of powedered pitch, and after being thoroughly mixed themixture is subjected to pressure in a suitable mold until denselycompacted in the desired form. During this operation the mold is heatedto a suflicient ten'iperature to soften the hard. pitch and cause it toflow and envelop the carbon particles, thus binding thematerial toApplication filed May 14,

1927. Serial No. 191,540.

gether. The disk'is then removed from the mold and baked in a furnace ata temperature which will set the binder and cause the carbon particlesto be rigidly coked together. Binders other than pitch may be used, tarand saccharine solutions being suitable, or any other material whichwill carbonize and coke the carbon particles together in the mannerabove described.

In the present embodiment, after the disk has been formed, as abovedescribed, it is impregnated with a somewhat elastic or re silientmaterial which fills the interstices and renders the disk much moredurable when subjected to impact. Materials which have been foundsuitable for this purpose are rubber, bakelite, celluloid and the like.lhe resilient substance may be forced into the in terstices of the diskin any well known or desired manner,as by pressure or under a vacuum,and may thereafter be cured or vulcanized by being subjected toheatand/or pressure is well understood in the art. Any temperaturereached in curing or vulcanizing such substance is far below anytemperature at which the carbon disk will be come distorted or changed.

The resilient material not only increases the durability of the disk butmay be chosen to improve the appearance thereof and also renders thedisk more impervious to the pasof liquids therethrough than it wasbefore.

While I have mentioned a few compositions which embody my invention,these are described by Way of illustration only and not by way oflimitation, and it is obvious that many other embodiments will. readilyoccur to those skilled in the art to which this appertains. I do not,therefore, limit myself to the precise materials described but claim asmy invention all embodiments thereof coming within the scope oftheappended claims.

I claimz 1. A disk for water meters coin 'nrising a coked body of carbonimpregnated with re silient material,

2. A disk for water n'ieters and the like, consisting of carbonparticles held together by a coked binder, and a resilient materialfilling the interstices of said coked material.

3. A disk for water meters and the like, comprising a rigidform-sustaining base of carbon, ancl'a resilient material permeatingcomprising a porous, rigid, form-sustaining the interstices of saidcarbon base. carbon base, the interstices of which are filler] 4. A disk91 water meters and the like, with vulcanized rubber- 10 comprising a,porous, rigid,form-sustaining In testimony whereof I hereunto aflix my 5carbon base, the interstices of which are filled signature this 10th(lay of May, 1927.

v with rubber.

5, A disk for wate meters and the like, NELSON c. COTABISH.

